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en:aws [2014/08/18 18:11] – [Common difficulties] fluktuaciaen:aws [2014/08/18 19:31] – [Auto diagnostics] fluktuacia
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   * Seizing up (([[http://www.digitalham.co.uk/weather/equipment/watson-w8681/wind-speed/|W8681 wind speed indicator disassembly and repair]]))   * Seizing up (([[http://www.digitalham.co.uk/weather/equipment/watson-w8681/wind-speed/|W8681 wind speed indicator disassembly and repair]]))
  
-Solvable by using other technologies - e.g. sonic or ionization anemometer.+Solvable by using other anemometer designs - e.g. sonic or ionization anemometer.
  
 ==== Wind direction ==== ==== Wind direction ====
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 {{:cs:designs:meteo:wind_vector.jpg?200 |}}  {{:cs:designs:meteo:wind_vector.jpg?200 |}} 
  
-Weather vane with wind rose serves as the most basic detector. The position of the vane is read by a reed switch and it is recorded when changes.+Weather vane with wind rose serves as the most basic wind detector. The position of the vane is read by a reed switch and it is recorded when it changes.
  
 === Common difficulties === === Common difficulties ===
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-Can be solved by using more sophisticated anemometer that measures vector (ionization or sonic)+Can be solved by using more sophisticated anemometer designs that measure vectors (for example ionization or sonic).
  
 ==== Precipitation ==== ==== Precipitation ====
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 ==== Snow precipitation ==== ==== Snow precipitation ====
  
-According to demands of a weather station operator, there is a wide variety of parameters that can be measured.  +According to requirements of a weather station operator, a wide variety of snow parameters can be measured.  
  
 === Height === === Height ===
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 ==== Humidity ==== ==== Humidity ====
  
-Humidity sensors are positioned in radiation shield. +Humidity sensors are located in radiation shield. 
  
 [[cs:sht25v|SHT25V01A]] - sensor with I²C output and optional self-testing by heating of the measuring element.   [[cs:sht25v|SHT25V01A]] - sensor with I²C output and optional self-testing by heating of the measuring element.  
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 ==== Temperature ==== ==== Temperature ====
  
-Measuring the temperature of air, although being one of the most important function of the station, is in some cases performed incorrectly - e.g. by letting the Sun influence the value. A solution to this problem is so-called radiation shield, which prevents the effect of radiation on the sensor.+Measuring the temperature of the air, although being one of the most important function of the station, is in some cases performed incorrectly - e.g. by letting the Sun influence the value. A solution to this problem is so-called radiation shield, which prevents the effect of radiation on the sensor.
  
-Apart from commonly used [[cs:wire_sensors#mereni_teploty|DS18B20]]  sensor, a more modern option exists as well - [[cs:lts|LTS01A]]+Apart from commonly used [[cs:wire_sensors#mereni_teploty|DS18B20]] sensor, a more modern option exists as well - [[cs:lts|LTS01A]]
  
 ==== Pressure ==== ==== Pressure ====
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 === Luminous flux === === Luminous flux ===
  
-Use of photovoltaic cell, measuring output in W/m². +Use of a photovoltaic cell, measuring output in W/m². 
  
 === UV index === === UV index ===
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 ==== Chemical sensors ==== ==== Chemical sensors ====
  
-  * Gas detection CO, CO2, N2... H2S, CH4.. [[http://www.ti.com/lsds/ti/data-converters/sensor-afe-products.page?paramCriteria=no#p158=Serial%20I2C|Sensor AFE]]+  * Gas detection CO, CO2, N2... H2S, CH4.. [[http://www.ti.com/lsds/ti/data-converters/sensor-afe-products.page?paramCriteria=no#p158=Serial%20I2C|AFE Sensor]]
   * PH-meter   * PH-meter
  
 ===== Communication interface ===== ===== Communication interface =====
  
-The weather station has several possibilities of connection and communication interface with other devices. +The weather station has several possibilities for interfaces to connect and communicate with other devices.
 ==== RS232/RS485 ==== ==== RS232/RS485 ====
  
-Modules  [[cs:rs232single|RS232SINGLE01A]] or [[cs:ttlrs485|TTLRS48501A]] and microcontroller are suitable to establish a connection depending on the application complexity.+Modules  [[cs:rs232single|RS232SINGLE01A]] or [[cs:ttlrs485|TTLRS48501A]] with microcontroller are suitable to establish a connection depending on the application complexity.
  
 ==== Ethernet ==== ==== Ethernet ====
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 === I²C master === === I²C master ===
  
-In this case, the entire device acts as [[cs:usbi2c| I²C to USB converter]], with reading from individual sensors implemented by program running in USB HOST device. The advantage of this design lies in possibility of obtaining relatively precise information about an absolute time in which the values were measured. Furthermore, changes in software and configuration can be done simply by updating the control program without a risky firmware replacement.+In this case, the entire device acts as [[cs:usbi2c| I²C to USB converter]], with reading from individual sensors implemented by program running at USB HOST device. The advantage of this design lies in possibility of obtaining relatively precise information about an absolute time in which the values were measured. Furthermore, changes in software and configuration can be done simply by updating the control program without a risky firmware replacement.
  
 === Emulated COM port === === Emulated COM port ===
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-===== Reading of measured values =====+===== Reading of the measured values =====
  
 This design offers a possibility of connecting variety of sensors, which are initialised at every station startup. It uses [[cs:i2c|I²C bus]]  with [[cs:i2chub|I2CHUB02A]] module and predefined set of sensors. This design offers a possibility of connecting variety of sensors, which are initialised at every station startup. It uses [[cs:i2c|I²C bus]]  with [[cs:i2chub|I2CHUB02A]] module and predefined set of sensors.
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 ===== Auto diagnostics ===== ===== Auto diagnostics =====
  
-Necessary to implement algorithms controlling mutual correlations of measured values and to detect anomalies.+Still necessary to implement algorithms controlling mutual correlations of measured values and to detect anomalies.
  
-  * Wind direction can not change without speed indication by anemometer.+  * Wind direction can not change without speed indication from anemometer.
  
  
en/aws.txt · Last modified: 2015/03/05 22:49 (external edit)